第四脑室皮样囊肿临床上很少见,现报告1例如下: 男,12岁。头昏、头痛一月余伴呕吐一周于1987年4月25日入院。检查:神志清楚,视乳头水肿明显,步态不稳,左侧指鼻试验阳性。(T扫描诊断为“小脑蚓部囊性病变并梗阻性脑积水”。在全麻下行后颅窝探查,术中见小脑蚓部增宽,脑波动消失,穿刺蚓部放出15ml囊液。切开蚓部皮质,见第四脑室内有约4×4×3cm大小肿物,内为 Fourth ventricle dermoid cysts are clinically rare, now report a case as follows: Male, 12 years old. Dizziness, headache January with vomiting a week in April 25, 1987 admission. Check: Consciousness, apparent papilledema, unsteady gait, the left finger nasal test was positive. (T scan diagnosis of “cerebellar verruciform cystic lesions and obstructive hydrocephalus.” Posterior cranial fossa exploration under general anesthesia, intraoperative see cerebellar vermis broadened, brain wave disappeared, punctured vermilion release 15ml cyst fluid. Cut the earthworm cortex, see the fourth ventricle about 4 × 4 × 3cm size of the tumor, within